id	keyword
gc-725	ore
gc-725	triassic
gc-725	deposits
gc-725	base
gc-725	metal
gc-725	carbonate
gc-725	balkan
gc-725	kremikovtsi
gc-725	vratsa
gc-725	bulgarian
gc-725	district
gc-725	rocks
gc-725	stratiform
gc-725	barite
gc-725	damyanov